Portable oxygen concentrator



FIG. 1 is a right perspective view of the portable oxygen concentrator of the present design;

FIG. 2 is a front view of the portable oxygen concentrator of the present design;

FIG. 3 is a rear view of the portable oxygen concentrator of the present design;

FIG. 4 is a right side view of the portable oxygen concentrator of the present design;

FIG. 5 is a left side view of the portable oxygen concentrator of the present design;

FIG. 6 is a top view of the portable oxygen concentrator of the present design; and,

FIG. 7 is a bottom view of the portable oxygen concentrator of the present design.

The broken lines showing additional features of the portable oxygen concentrator in FIGS. 1-7 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portable oxygen concentrator, as shown and described. 